Electric furnace.



Vifnesses;

E. CORNELIUS. ELEGTBIG' FURNACE.

APPLICATION FILED JULY 9, 1908.

900,486, Patented 0011. 6, 1908.

17? van 7mm"? UNITED STATES PATENT OFFICE.

ERIK CORNELIUS, OF TROLHATTAN, SWEDEN.

ELECTRIC FURNACE.

To all whom it may concern:

Be 1t known. that I, ERIK CORNELIUS, a

' subject of the King of Sweden, and resident trodes.

(if Trolhattan, in the Kingdom of Sweden, have invented certain new anduseful Improvements in Electric Furnaces, of which the following is a specification, reference being had therein to the accompanying drawln lhis invention relates to an electric furnace for heating solid substances, for different purposes. The said furnace is specially suitable for the manufacturing of graphite and for the introducing of graphite into ob- -ects. J The characteristic feature of the furnace, which is horizontal or substantially horizontal, consists in its operating chamber being ring-shaped, so that charging, heating and discharging of the substance can be effected simultaneously and continuously and the heating place can be changed successively along the operating chamber. For the said changing one of the electrodes is movable, so that it can easily be moved along the operating chamber.

Figure 1 of the accom anying drawing is a vertical section of the fiirnace. Fig. 2 is a plan view of the same.

The furnace is ring-shaped, as shown in Fig. 2, and its outer wall as well as its center part is of fireroof material. The bottom part 3 is of car on and forms one of the elec- The other electrode 4 is mounted from above in the operating chamber'of the furnace and has a vertical position. The said electrode 4 is fixed in a turnable arm 5 or the like, extending from avsuitable, central support. The substance to be treated is charged in the furnace for example at b and the roduct resultin from the o eration is discharged at a, t 1e material eing charged into one portion of the furnace, while a previous charge is being treated in another portion of the furnace. In Fig. 1,

instimce, the left hand ortion of the furnace is in o oration while t 1e right hand portion is rea to receive afresh char e. As the places fin the charging and disc iarging o erations are changed along the o crating ciiamber in the direction indicate by the arrow, the electrode. 4 and the arm 5 turned in the same direction.

6, Fig. 1, designates carbon-powdcrand 7 Specification of Letters Patent. Application filed July 9', 1908.

necessary, so that it is mounte conductin matcria Patented Oct. 6, 1908.

Serial N0. 442,756.

are objects, embedded in the powder in order to be changed into graphite.

The electric current between the electrodes is kept constant by turning the electrode 4 in the direction of the arrow, Fi 2, when into less conductin carbon powder 91. e. powder of a lower tem erature, provided that the furnace is in fu l action, in which case the temperature between both the electrodes is 3000 to 4000 Cent.

The operation-made possible by the de scribed arrangements can be carried on continuously, as already stated, and in this manner the disadvantage of ordinary electric furnaces hitherto used is removed, viz. that the current can not be closed in the furnace, without further ado, but both the electrodes .60 carbon must beconnected reviousl b a core ofa owing to the incapacity of the cold carbon powder of conducting the current. Further the usual disadvantage of varying power consumption is removed by the described arrangements which is of great economical importance.

The furnace may, evidently, be poly onal in from the ring shape.

llVhile the drawings show only one movable electrode, it will be understood that several may be used and that they may be.so connected as to permit the use of a current of any desired character.

As further examples of using the furnace' may be stated the cementing of iron and steel, the manufacturing of carborundu'm, the

.80 or have any other shape more or less r lf'ferreducin of metallic oxids by means of carbon an so on. v

Having now described my invention, wha

I claim as new and desire'to secure by Letters Patent is:

.1. An electric furnace for the purpose set forth, comprising an annular chamber, a fixed electrode in and coextensive with the bottom of said chamber, and a movable electrode movable along the said chamber, a In Witness whereof, I have hereunto si ned radish} arm carrying the movable electrode, my name in'the presence of two subscrfiaing and a rotary sup ort for said arm mounted Witnesses.

centrally in the lurnace whereby the oper- ERIK CORNELIUS. ations of charging, heating and discharging Witnesses: maybe efi'ecte simultaneously, substantially JOHN ERVING,

as described and for the purpose set forth. B. CASBOSTJN. 

